Ebenamariosides A-D: Triterpene Glucosides and Megastigmanes from the Leaves of Diospyros maritima.

Ebenamariosides A-D: Triterpene Glucosides and Megastigmanes from the Leaves of Diospyros maritima.
Chem Pharm Bull (Tokyo). 2019;67(12):1337-1346
Authors: Kawakami S, Miura E, Nobe A, Inagaki M, Nishimura M, Matsunami K, Otsuka H, Aramoto M
Abstract
The 1-BuOH-soluble fraction of the methanol (MeOH) extract of Diospyros maritima was separated by chromatographic techniques to give three new oleanane-type and one new ursane-type triterpene glucoside, named ebenamariosides A-D (1-4); two megastigmanes were also isolated. The structures of triterpene glucosides was elucidated with extensive investigation by one and two dimensional NMR spectroscopy and the structures were confirmed by partial enzymatic hydrolyses to give the corresponding mono-glucosides and aglycones. The structures of the megastigmanes, including their absolute stereochemistries, were elucidated by spectroscopic evidence and by the modified Mosher's method. Two megastigmanes were chemically correlated and their absolute structures were unambiguously determined. The cytotoxicity of the triterpene glucosides and their degradation products were assayed. They did not show any significant activity.
PMID: 31787660 [PubMed - in process]

Source: Chemical and Pharmaceutical Bulletin - December 5, 2019 Category: Drugs & Pharmacology Authors: Kawakami S, Miura E, Nobe A, Inagaki M, Nishimura M, Matsunami K, Otsuka H, Aramoto M Tags: Chem Pharm Bull (Tokyo) Source Type: research